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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 1,539,900 | $ 1,468,119 | $ 1,249,787
Other comprehensive income before reclassifications | 950 | 14,646 |
Amounts reclassified from accumulated other comprehensive loss | 156 | 200 |
Total other comprehensive income | 1,106 | 14,846 | 16,206
Balance at end of period | 1,398,341 | 1,539,900 | 1,468,119
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (19,094) | (33,940) | (50,146)
Total other comprehensive income | 1,106 | 14,846 | 16,206
Balance at end of period | (17,988) | (19,094) | (33,940)
Defined benefit pension items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (10,408) | (10,801) |
Other comprehensive income before reclassifications | (162) | 193 |
Amounts reclassified from accumulated other comprehensive loss | 156 | 200 | 501
Total other comprehensive income | (6) | 393 |
Balance at end of period | (10,414) | (10,408) | (10,801)
Currency translation adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (8,686) | (23,139) |
Other comprehensive income before reclassifications | 1,112 | 14,453 |
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 |
Total other comprehensive income | 1,112 | 14,453 |
Balance at end of period | $ (7,574) | $ (8,686) | $ (23,139)

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